181 lines
4.0 KiB
C
181 lines
4.0 KiB
C
/*
|
|
* Common code for low-level network console, dump, and debugger code
|
|
*
|
|
* Derived from netconsole, kgdb-over-ethernet, and netdump patches
|
|
*/
|
|
|
|
#ifndef _LINUX_NETPOLL_H
|
|
#define _LINUX_NETPOLL_H
|
|
|
|
#include <linux/netdevice.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/list.h>
|
|
|
|
union inet_addr {
|
|
__u32 all[4];
|
|
__be32 ip;
|
|
__be32 ip6[4];
|
|
struct in_addr in;
|
|
struct in6_addr in6;
|
|
};
|
|
|
|
struct netpoll {
|
|
struct net_device *dev;
|
|
char dev_name[IFNAMSIZ];
|
|
const char *name;
|
|
void (*rx_hook)(struct netpoll *, int, char *, int);
|
|
|
|
union inet_addr local_ip, remote_ip;
|
|
bool ipv6;
|
|
u16 local_port, remote_port;
|
|
u8 remote_mac[ETH_ALEN];
|
|
|
|
struct list_head rx; /* rx_np list element */
|
|
struct work_struct cleanup_work;
|
|
};
|
|
|
|
struct netpoll_info {
|
|
atomic_t refcnt;
|
|
|
|
unsigned long rx_flags;
|
|
spinlock_t rx_lock;
|
|
struct mutex dev_lock;
|
|
struct list_head rx_np; /* netpolls that registered an rx_hook */
|
|
|
|
struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */
|
|
struct sk_buff_head txq;
|
|
|
|
struct delayed_work tx_work;
|
|
|
|
struct netpoll *netpoll;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
#ifdef CONFIG_NETPOLL
|
|
extern int netpoll_rx_disable(struct net_device *dev);
|
|
extern void netpoll_rx_enable(struct net_device *dev);
|
|
#else
|
|
static inline int netpoll_rx_disable(struct net_device *dev) { return 0; }
|
|
static inline void netpoll_rx_enable(struct net_device *dev) { return; }
|
|
#endif
|
|
|
|
void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
|
|
void netpoll_print_options(struct netpoll *np);
|
|
int netpoll_parse_options(struct netpoll *np, char *opt);
|
|
int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
|
|
int netpoll_setup(struct netpoll *np);
|
|
int netpoll_trap(void);
|
|
void netpoll_set_trap(int trap);
|
|
void __netpoll_cleanup(struct netpoll *np);
|
|
void __netpoll_free_async(struct netpoll *np);
|
|
void netpoll_cleanup(struct netpoll *np);
|
|
int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
|
|
void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
|
|
struct net_device *dev);
|
|
static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
|
|
{
|
|
unsigned long flags;
|
|
local_irq_save(flags);
|
|
netpoll_send_skb_on_dev(np, skb, np->dev);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETPOLL
|
|
static inline bool netpoll_rx_on(struct sk_buff *skb)
|
|
{
|
|
struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
|
|
|
|
return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
|
|
}
|
|
|
|
static inline bool netpoll_rx(struct sk_buff *skb)
|
|
{
|
|
struct netpoll_info *npinfo;
|
|
unsigned long flags;
|
|
bool ret = false;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (!netpoll_rx_on(skb))
|
|
goto out;
|
|
|
|
npinfo = rcu_dereference_bh(skb->dev->npinfo);
|
|
spin_lock(&npinfo->rx_lock);
|
|
/* check rx_flags again with the lock held */
|
|
if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
|
|
ret = true;
|
|
spin_unlock(&npinfo->rx_lock);
|
|
|
|
out:
|
|
local_irq_restore(flags);
|
|
return ret;
|
|
}
|
|
|
|
static inline int netpoll_receive_skb(struct sk_buff *skb)
|
|
{
|
|
if (!list_empty(&skb->dev->napi_list))
|
|
return netpoll_rx(skb);
|
|
return 0;
|
|
}
|
|
|
|
static inline void *netpoll_poll_lock(struct napi_struct *napi)
|
|
{
|
|
struct net_device *dev = napi->dev;
|
|
|
|
if (dev && dev->npinfo) {
|
|
spin_lock(&napi->poll_lock);
|
|
napi->poll_owner = smp_processor_id();
|
|
return napi;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static inline void netpoll_poll_unlock(void *have)
|
|
{
|
|
struct napi_struct *napi = have;
|
|
|
|
if (napi) {
|
|
napi->poll_owner = -1;
|
|
spin_unlock(&napi->poll_lock);
|
|
}
|
|
}
|
|
|
|
static inline bool netpoll_tx_running(struct net_device *dev)
|
|
{
|
|
return irqs_disabled();
|
|
}
|
|
|
|
#else
|
|
static inline bool netpoll_rx(struct sk_buff *skb)
|
|
{
|
|
return false;
|
|
}
|
|
static inline bool netpoll_rx_on(struct sk_buff *skb)
|
|
{
|
|
return false;
|
|
}
|
|
static inline int netpoll_receive_skb(struct sk_buff *skb)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void *netpoll_poll_lock(struct napi_struct *napi)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline void netpoll_poll_unlock(void *have)
|
|
{
|
|
}
|
|
static inline void netpoll_netdev_init(struct net_device *dev)
|
|
{
|
|
}
|
|
static inline bool netpoll_tx_running(struct net_device *dev)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#endif
|